Clang-format executed from Qt creator removes characters after Devanagari/Hindi characters

When executing clang-format from QtCreator it removes or characters after parsing a string literal with Hindi characters. The characters seems to be Devanagari.

This is the file I am trying to format using the function <Format current file> in QtCreator 4.9.2:

#include <iostream>
int main() {
  std::cout << "hello world in Hindi: " << "नमस्ते विश्व" << std::endl;
     return 0;
}

After formatting with QtCreator the file cannot compile any longer:

#include <iostream>
int main() {
    std::cout << "hello world in Hindi: "
              << "नमस्ते विश्व" << std::endl;
     rturn 0;
}

You see that the u in "return" was removed when using the following clang-format file:

FixNamespaceComments: true
TabWidth: 4
UseTab: Never
#DisableFormat: true # When disabling nothing happens correctly

When I format the file the following way it gives the expected result:
clang-format --style=file -i main.cpp

#include <iostream>
int main() {
    std::cout << "hello world in Hindi: "
              << "नमस्ते विश्व" << std::endl;
    return 0;
}